Malicious PDF — malware analysis report

Static analysis result for SHA-256 d644e676e4dd869d…

MALICIOUS

PDF

87.5 KB Created: 2021-09-02 00:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 38d3dc12c1d75454408fc2b1c32f21b1 SHA-1: 29d69642718383119652583d7a15d45bc811e0fa SHA-256: d644e676e4dd869df5985c5744bd043443472e34f3ec7bb62889c3f04fd80f3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of a link farm on disposable hosting and compromised CMS uploads further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nomylo.ru/uplcv?utm_term=reproduction+in+angiosperms+class+12 PDF link annotation
    • https://organicfertilizerproduction.com/d/files/97914769794.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/825db72924757f5802ebae7777c31808/15990019208.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/diduwosotarekajazovuzu.pdfIn PDF document text
    • http://mousike.it/img_ins/files/tagapux.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/28983e57c6e669f7781c39a8a66350fb/27817127635.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/dopefoweluxareto.pdfIn PDF document text
    • http://gpn1971.org/clients/a/a2/a25689677492d603657f1241a2a69ea8/File/finofezagi.pdfIn PDF document text
    • http://planetamama.ru/files/file/fedagazomowapozagijifa.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b518845ffaa---wusupanizob.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083264ce26a1---pulubiguxasasiwo.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/natemagupovagilitava.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/fe63252ecc14d13c0f36b78799ee476a/12721703144.pdfIn PDF document text
    • https://hsse.cl/files/tavulixisas.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/8gjdhaup1408b6g50ou8qvfuk6/xuzutatomukisurok.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/kadimobukovelukige.pdfIn PDF document text
    • https://soechi.id/userfiles/file/11840867609.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/19177260715.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/24863583668.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b4270135161d38290ee793fe0db898fa/73320081297.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/75078910689.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/89177607344.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/xivalowifujutuxupeguw.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/rezugifa.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/52220725246.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/0f23ef2fd8ee415c98d08e3ba2d8feaf/44999749776.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9760169a3---duluvexat.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/2c9a5a0fe993b36aff6b18ed6cb1b8e0/91826914616.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF306 16752 bytes
SHA-256: b11ea2a795ec3a588e7502600c0b1d42664dd371406da7af9170a46b388c2527
font_01_sfnt_off00011d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D99 11176 bytes
SHA-256: 62874beb5a9198a78046161b579729d3c2f23d703f3875799ed0eaf902d5f1b9
font_02_sfnt_off00013793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13793 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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